OpenCog is an Open Source software project aimed at directly confronting the AGI challenge, based on mathematics and using biologically inspired algorithms, including algorithms for common-sense reasoning and machine learning. Components include natural language processing and speech generation, robotics, game control, and vision.

PSXImager is a collection of tools for dumping and (pre-)mastering PlayStation 1 ("PSX")
CD-ROM images.
What sets PSXImager apart from standard ISO 9660 imaging tools is that PSXImager handles
images in the CD-ROM XA format,
which is what the PlayStation 1 uses.

Playtomic is a set of client and server APIs for game leaderboards, user generated content, and dynamic updates. It began as a hosted service providing tools and analytics for game developers, but is now available for developers to operate on their own. It includes the API server which is written in NodeJS and backed with MongoDB, along with game client APIs for HTML5, Flash, iOS, Android, Windows, and Unity3d games.

jMonkeyEngine is a game engine made for developers who want to create 3D games following modern technology standards. The framework is programmed entirely in Java, and aimed at wide accessibility and fast deployment to desktop, Web, and mobile platforms. It is not a visual “RPG Maker” or a drag-and-drop “FPS mod”. If you are comfortable writing Java code, you can rely on jMonkeyEngine as your next 3D game’s foundation.

RoseThorn is a cross-platform library for 2D and 3D games running on GNU/Linux (and possibly other Unix-like OSes) and Windows. Features include: hardware accelerated 2D and 3D rendering; Ogg and WAV Sound support with OpenAL; Lua scripting; BMP, JPEG, and PNG image loading and saving (from screenshots); easily created and modified user interfaces with XML and CSS, combined with Lua event handling; separate 2D and 3D libraries; support for multiple fonts in both TTF and bitmap formats; support for OBJ, 3DS, MD5, and RTM model formats; skeletal animation (a work in progress); support for UDP and TCP networking; thread and mutex support; a Simple Shader API; 2D animated sprites; and some basic cryptography support. There is simple event management, with key/mouse bindings easily customized from the in-game console, config file, command line, or GUI.

android-store is an in-app billing and storage library for Android. It simplifies the Google Play API, stores currency/goods balances, improves security, provides event handling, and includes a sample App for reference.

Open RPG Maker is a 2D RPG creation utility, similar to the popular RPG Maker series. It is mostly based on RPG Maker 2003, but with some added features and more advanced usability. It allows users to create games similar to the original Final Fantasy games, such as FF5 and FF6, though it also supports Zelda-like games. Compared to the RPG Maker series, it supports additional image and music file formats, and 32x32 tiles of up to 24bpp instead of 16x16 8bpp.